TIDUF92 December   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Wired System Description
    2. 1.2 Wireless System Description
    3. 1.3 Power Supply Options
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 BQ79718B-Q1
      2. 2.3.2 TPS3436-Q1
      3. 2.3.3 TPS715-Q1
      4. 2.3.4 TPD6E004
      5. 2.3.5 CC2662R-Q1
      6. 2.3.6 TXU0204-Q1
      7. 2.3.7 ISO7741-Q1
      8. 2.3.8 ESD2CAN24-Q1
      9. 2.3.9 LM5168-Q1
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
      1. 3.2.1 Hardware Setup
      2. 3.2.2 Software Setup
    3. 3.3 Test Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

2.3.1 BQ79718B-Q1

The BQ79718V-Q1 (wired and wireless operation) provides high-accuracy cell voltage measurements for up to 18S battery modules in high-voltage battery management systems in xEV and EV. The family of monitors offers different channel options in the same package type, providing pin to-pin compatibility and supporting high reuse of the established software and hardware across any platform. With the daisy chain isolated by transformer and capacitor, the device supports centralized and distributed architectures in xEV powertrain applications.

Key features of the BQ79718V-Q1 include:

  • AECQ100 qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature range
    • Device human body model (HBM) electrostatic discharge (ESD) classification level 2
    • Device CDM ESD classification level C1
  • Functional safety-compliant:
    • Documentation to aid ISO 26262 system design
    • Systematic capability up to ASIL D
    • Hardware capability up to ASIL D
  • Measure 9 to 18 batteries in series per device, stackable up to 64 devices
  • Dedicated ADC with typical ±1mV accuracy
  • Cell voltage and battery pack current measurement synchronized to 64μs
  • Support limp-home mode with full redundancy
  • Integrated post-ADC configurable digital low-pass filters
  • Supports bus bar without affecting measurement accuracy
  • 12 GPIOs for temperature sensor, analog, digital, I2C controller, and SPI controller
  • Internal cell balancing:
    • Balancing at 300mA
    • User-controlled PWM adjustment cell balancing current
    • Built-in balancing thermal management with automatic pause and resume control
  • Robust daisy chain communication and support ring architecture
  • Hardware reset by host simulates POR-like event without battery removal
  • Support transformer and capacitive isolation
  • On-chip memory for one-time custom programming
  • Low-power mode current < 6μA
  • Compatible with BQ79600-Q1 with SPI and UART interface